GNUstep on 64bit windows

[Richard Frith-Macdonald]

I've been porting gnustep-base to windows-10 64bit

If you install msys2 on a 64bit windows system, then use the appropriate script 
from core/scripts to install the dependencies, you should be able to 
build/install gnustep-make and gnustep-base from svn trunk and end up with a 
system that passes more or less the same regression tests that the mingw32 
installation passes (so hopefully if anyone wants to try gui/back they might 
actually work).
Thanks to Seong Gu Lee for providing the intial patches to get the effort 
started.